import java.util.Scanner;

public class Test {
    //计算1/1-1/2+1/3-1/4+1/5 …… + 1/99 - 1/100 的值
    public static void main2(String[] args) {
        double sum = 0;
        int flg = 1;
        for (int i = 1; i <= 100; i++) {
            sum += 1.0/i*flg;
            flg = -flg;
        }
        System.out.println(sum);
    }







    //二进制1的个数
    public static void main1(String[] args) {
        int count = 0;
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        while(a != 0){
            a = a&(a-1);//将a的二进制表示中的最低位为1的改为0
            count++;
        }
        System.out.println(count);
    }

}
